Magnetic holding means



July 30, 1940.

W. E. BURTON MAGNETIC HOLDING MEANS Filed Jan. 16, 1937 ATTORNEYPatented July 30, 1940 UNITED STATES PATENT OFFICE 2,209,809 MAGNETICHOLDING MEANS Walter E. Burton, Akron, Ohio I Application January 16,1937, Serial No. 120,975 4 Claims. (Cl. 175 21) This invention relatesto improvements in mag- Figure 7 is a sectional view showing a portionnetic means for yieldably holding a closure memof a metallic structureand illustrating the manber in an operative position. While the invennerof securing my improved holding means tion is intended for use whereverit may be adthereto.

vantageously employed, to hold any type of clo- Figure 8 is a crosssectional view taken as indi- 5 Sure member in a, closed position, it isillustrated cated by the lines 8 8 of Figure 7,

in the drawing and hereinafter described as ap- Figure 9 is a central,vertical, sectional view plied to a door adapted to be used forbookcases. taken as indicated by the lines 9 9 of Figure cupboards,cabinets or similar structures. 10 and illustrating a modified form ofmagnet 10 Objects of the invention are to provide animwhich may be usedin reducing the invention to 10 proved magnet of simple constructionwhich may practice, be quickly and conveniently secured to a struc-Figure 10 is a front, elevational view of same. ture having a closuremember and used in con- 'I'he invention will now be described withrefernection with an armature whereby the member ence to the particularadaptation thereof illusl5 when closed will be maintained in thatposition trated. The numeral II denotes a permanently l5 under normalconditions and which can be easily magnetlzed horseshoe magnet which isof cylin` and conveniently opened when desired. drical form and which isprovided with a dia- Further objects are to provide magnetic doormetrically extending cut l2 which extends thereholding means which canbe quickly and securely in from the executive face thereof and termi- Kn mounted in an operative position on a structure nates adjacent therear end thereof, thus proby positioning the same in a. bore formed inthe viding a horeshoe magnet having two prongs I3 door or a portion ofthe structure adjacent thereand I4. The walls of the cut I2 divergeinwardly to to provide an exteriorly threaded cylindrical from theexecutive face of the magnet to a transmagnet having means for formingthreads in verse plane adjacent the rear end thereof and g5 the wall ofsuch bore whereby the same may be terminate in a rounded end wall.

threaded in a Wooden structure and adjustably The magnet II is providedwith external screw retained therein and to provide additional meansthreads I5 which are preferably interrupted at for securing the magnetin an operative position. circumferentially spaced intervals with thelon- The above objects are accomplished and addigitudinal grooves I6.The grooves I6 are potional advantages are obtained by the novelconsitioned therein to form sharp ends on the threads 30 structionhereinafter described with reference to I5 which facilitate the cuttingof threads in the the accompanying drawing wherein there is wall of thebore formed in a wooden structure as shown an illustrative embodiment ofthe invenhereinafter described. The slot I2 forms a gap tion, it beingunderstood that the invention may between the prongs of the magnet andserves as be adapted in various ways to various structures a kerf inwhich a screw driver blade may be in- 35 and that changes andmodifications may be made serted to operatively position the magnet in awhich come within the scope of the claims herebore. 'I'he rear endportion of the magnet II unto appended. is provided with an axial boreIl which extends Inthe drawing: therethrough from the cut I2 to the rearend Figure 1 is a side elevational view ,of a permathereof and which isdesigned to receive a screw nent magnet constructed in accordance withthis I8 or other fastening means adapted to hold the invention, magnetin an operative position. At the forward Figure 2 is a plan view ofsame, face of the magnet the middle portion of the cut Figure 3 is a.central, vertical, sectional view I2 is enlarged to form an opening I'Ibwhich is 4. taken as indicated by the lines 3 3 of Figure 2, in coaxialalinement with the bore Il and is 45 Figure 4 is a cross sectional viewof a door adapted to receive a screw driver blade which frame having adoor operatively positioned theremay be used to operate the screw I8. inand showing one manner of 'operatively at- In Figure 4 there is shownthe forward portion taching my improved holding means thereto, of astructure in which a door I9 is hingedly se- Figure 5 is'a sectionalview showing a portion cured between the stiles 20 and 2l by means of 5of a door and a portion of a stile with holding the hinges 22. In thisparticular structure the means constructed in accordance with thisinvenfree edge of the door I9 closes against a strip 23 tion operativelyattached thereto, which overlaps the free edge of the door when Figure 6is a similar view illustrating another the door is in a closed position.u manner of using my improved holding means, The overlapping portion ofthe strip 23 is provided-'with a here 24 which is formed therein fromthe forward side thereof. A magnet II is secured in the bore 24 with theexecutive face thereof ush with the forward face of the strip B 23. Thearmature 25 is secured to the inner face of the door I9 by means of thescrews 26 or other suitable fastening means whereby the door when closedwill position the armature 25 in operative relation to the poles of themagnet II.

It will be seen that the armature 25 will be attracted by the magnet Iland that the door will be yieldably held in a closed`A position withsuilcient force to prevent its being unintentionally opened.

In Figure there is shownl a portion of a frame member 21 in which ismounted a door 28 which is shown in a closed position. Themember 21 isprovided with a bore 29 in which there is mounted a magnet II which maybe of the type'illustrated 90 in Figure 1 but which asshown is providedwith a smooth exterior surface. In this'adaptation of the invention themagnet I I is secured in the bore 23 by means ofthe screw I8 with theexecutive face of the magnet flush with the face of the member 21.

'I'he door 28 is provided on the contacting edge thereof with anarmature 38 which is formed of a plurality of layers of magneticallypermeable material. vThe layers 30 are secured to the edge of the door28 where the armature will be in an operative rposition to the magnet IIwhen the door is closedby means of the screw 3l. The armature 30 is thusconstructed of a plurality of layers so thatone vor more layers may beselectively employed to regulate the force with which the door is heldin a closed position.

In Figure 6 there is shown a frame member 21 and a door 28 with onemagnet I I positioned in the member 21 and the other magnet I Ipositioned in the door. The magnets II are thus arranged with each poleof each magnet presented to the opposite pole of the other magnet, thusproviding a strong magnetic pull which will normally hold the door in 'aclosed position.

In Figure 'I there is shown a portion of a metallic structure 32 havinga metal door 33. A holding member 34 is secured to the structure 32 bymeans of the screws 35 or any suitable means. The holding member 34 isconstructed of rubber, Bakelite, 50 brass or any suitable material.

The holder is provided with a suitable bore 36 in which is snuglyreceived' a permanent magnet IIa. The holding member 34 thus presentsthe magnet to the edge ofthe door 33 which 55 forms an armature for themagnet and holds the ldoor in a closed position.

InvFigures 9 and 10 I have shown a bar magnet I Ia having a kerf I2a inthe forward face thereof.

The magnet IIa is provided with an axial bore 80 I1a in which a'screW orothergfastening member may be inserted. The bar magnet Ila may beprovided with screw threads I5 and a screw driver blade inserted in thekerf I2a to operatively position it in a bore:

In the particular adaptation of the invention shown, the bore I1a isenlarged at the forward end thereof to receive the head of a screw orother fastening means and the bore I1a is enlarged adjacent the rear endthereof to form a shoulder 31 which may be engaged by a tool to pull themagnet Ila from a bore in which it is mounted.

While I have illustrated and described an improved form of horseshoemagnet adapted to be threaded into a bore, it will be understood thatthe magnet I I may be made of any suitable, cross sectional shapeadapted to be fitted in a seat formed in either the closure member orthe frame member.

It will thus be seen that I have provided a door holding means which maybe quickly and conveniently applied to a door, door frame or other partof a door structure which will not project in the door opening orpresent any protruding parts and which will be very eiilcient inyieldably` holding a door in a closed position.

Having thus illustrated my invention and de-A scribed the same indetail, what I claim as new and desire to secure by Letters Patent is:

1. In a permanent magnet, a cylindrical magnetized body, external screwthreads on said body, said threads being interrupted atcircumferentially spaced intervals to provide edges for cutting a threadin the wall of a bore.

2. In a permanent magnet, a cylindrical magnetized body, external screw.threads being interrupted at circumferentially spaced intervals toprovide edges for cutting a thread in the wall of a bore, said bodyprovided with a central bore for receiving a securing screw. A

3. In a permanent magnet, a cylindrical magnetized body, external screwthreads being interrupted at circumferentially spaced intervals toprovide edges for cutting a thread in the wall of a bore, said bodyprovided with a central bore for receiving a securing screw; the centralbore being enlarged at both ends to provide shoulders i whereby thesecuring screw may be wholly recessed into the magnet'and whereby hookmeans may be engaged with' the inner shoulder to facilitate removal ofthe magnet from a recess. 4. In a permanent magnet, a cylindrical,magnetized body, external screw threads on said body, said body providedwith a central bore for receiving a securing screw, the central borebeing enlarged'at both ends to provide shoulders where- 4 by thesecuring screw may be wholly recessed in said body and whereby hookmeans may be engaged with the inner shoulder to facilitate removal ofthe magnet from a recess. f

WALTER E. BURTON.

